Sink



FIG. 1 is a perspective view of a sink;

FIG. 2 is a top plan view of the sink of FIG. 1;

FIG. 3 is a bottom plan view of the sink of FIG. 1;

FIG. 4 is a front view of the sink of FIG. 1;

FIG. 5 is a rear elevational view of the sink of FIG. 1;

FIG. 6 is a left side view of the sink of FIG. 1; and,

FIG. 7 is a right side view of the sink of FIG. 1.

The broken lines showing the bottom and back views are included for the purpose of illustrating a portion of the sink that forms no part of the claimed design. 

The ornamental design for a sink, as shown and described. 